.SUFFIXES:

MCU := atmega328p
PROGRAMMER := usbtiny

TARGET := main.hex
BIN := main.elf
OBJ := main.o

SHELL := sh
CC := avr-gcc
OBJCOPY := avr-objcopy
SIZE := avr-size
AVRDUDE := avrdude

CFLAGS := -mmcu=$(MCU) -Os -Wall -Werror -Wextra -Wpedantic

all: $(TARGET)

$(TARGET): $(BIN)
	${OBJCOPY} -O ihex -j .text -j .data $< $@

$(BIN): $(OBJ)
	$(CC) $(CFLAGS) $< -o $@

%.o: %.c
	$(CC) $(CFLAGS) -Os -c $< -o $@

.PHONY: flash clean check size

flash: $(TARGET) size
	$(AVRDUDE) -p $(MCU) -c $(PROGRAMMER) -U flash:w:$<:a

clean:
	$(RM) main.o main.elf main.hex

check:
	cppcheck main.c

size: $(BIN)
	$(SIZE) --format=avr --mcu=$(MCU) $<